Phenotypic ratio: 10. Ratio for rounded-yellow seeds? 11. Ratio for wrinkled-yellow seeds? 12. Ratio for rounded-green seeds? 13. Ratio for wrinkled-green seeds? 14. What are the genotypes of the parents? (2 pts.) Activity #3 Write your answers on the blank provided. 1.) In some chickens, the gene for feather color is governed by codominance. An allele for black-feathered chicken is B, and the allele for white-feathered chicken is W. When crossed, a heterozygous phenotype is produced which is known as "erminette" (with white-black patterns on feathers). a.) What is the genotype for black chickens? b.) What is the genotype for white chickens? c.) What is the genotype for erminette chickens? 2.) If two erminette chickens are crossed: 3.) A cross a.) What is the percentage that they will produce black-feathered chicks? b.) What is the percentage that they will produce white-feathered chicks? c.) What is the percentage that they will produce erminette chicks? between red-flowered snapdragons and white-flowered snapdragons produces offspring with pink flowers. Let R-red flowers and W - white flowers. a.) What is the genotype of a plant with a phenotype of red flowers? b.) What is the genotype of a plant with a phenotype of white flowers? c.) What is the genotype of a plant with a phenotype of pink flowers? d.) What is the phenotype of a plant with a genotype of RW?
Answer (1)
Let's get those genetics gears turning! Remember, phenotypes are what we see, and genotypes are the hidden codes within the genes. Phenotypic Ratios: Rounded-Yellow: This is the dominant trait combination, so it will be the most common. Wrinkled-Yellow: This is a mix of dominant and recessive traits, so it will be less common. Rounded-Green: This is a mix of dominant and recessive traits, so it will be less common.Wrinkled-Green: This is the double recessive trait, so it will be the least common. Genotypes of the Parents: To get those ratios, the parents must have been heterozygous for both seed shape and seed color. That means: Parent 1: RrYy (Rounded, Yellow) Parent 2: RrYy (Rounded, Yellow) Now, let's tackle those chickens! a) Genotype for Black Chickens: BBb) Genotype for White Chickens: WWc) Genotype for Erminette Chickens: BWCross between two Erminette chickens (BW x BW): Punnett Square: | B | W|---|---|| B | BB | BW || W | BW | WW |Possible Offspring Genotypes: BB, BW, WWPossible Offspring Phenotypes: Black (BB), Erminette (BW), White (WW)Percentage of each phenotype:Black: 25% (1 out of 4)White: 25% (1 out of 4) Erminette: 50% (2 out of 4) Finally, let's explore those snapdragons: a) Genotype of Red Flowered Plant: RRb) Genotype of White Flowered Plant: WWc) Genotype of Pink Flowered Plant: RW (This is codominance, where both alleles are expressed, resulting in a blended phenotype.)d) Phenotype of a plant with the genotype RW: Pink flowers. Remember, genetics is like a puzzle, but with practice, you'll become a master puzzle solver!
